Fishing tool



INVENTOR QEGRGE W FOSTER L y/MMM ATTORNE YS Patented May 27, 1924.

narrare stares par GEORGE W. FOSTER, QF VANCOUVER, BRITISH COLUMBIA, CANADA, ASSIGNOR 0F FORTY PEB CENT T0 F. J'. RAGLIN, 0F COWICHAN LAKE, BRITISH COLUMBIA,

CANADA.

l FISHING TooL.

Application tiled December 4, 1922. Serial No. 604,862.

Afishing tools which has for its objects the provision of suitable means for withdrawing broken drills, rods, cables or casings from bored wells, and which consists essentially of a tube suspended by abail and having in its side walls a plurality of loosely fitting dogs adapted to fall into contact, during the lowering of the device into the well, with the rod or casing to be withdrawn and to so engage such rod or casing that when an upward movement is imparted to the device the'rod or casing is firmly gripped and withdrawn therewith, as will be more fully described in the following speciication in which Fig. 1 is a sectional view of my invention as in 4use for withdrawing a broken drill.

Fig. 2 is a sectional View Vof the device as in use for withdrawing the well casing.

Fig. 3 is a view of the device as in use for engaging a broken cable.

Fig. 4 is an enlarged fragmentary view of a portion of the tube 3 containing a dog holding slot.

Fig. 5 is an enlarged face view of one of the do s.

In the rawings like characters of refrence indicate corresponding parts in each gure. j -The numeral 1 indicates a drilled well yhaving a casing 2 forming a lining to the ing a bell shaped mouth 7 of a sufficient:

diameter to freely enter the well and to direct the shaft of a broken tool into the tube 3, as the device is lowered into contact therewith.

.The numeral 8 (see Fig. 2) is a tubular extension to the tube 3 terminating at its lower extremity in a rojectile shaped point 9 `for directing the evice clear of an)7 inwardly projecting obstructions within the well. The extensionsy 6 and 8 are interchangeable, either being used upon the tube 3 according to the work required to be done and are preferably attached to the tube 3 by a union 10. 11 (see Fig. 3) is a slot extending longitudinally of the tube 3 and throughout its length which is widened at its lower end to form an inverted V 12, for the purpose of leading a broken cable Which may be lying in the well, into position between the dogsl 15.-

13 indicates a plurality of rectangular apertures cut through the side walls of the tube 3, whichare preferably in pairs opposite to each other, 14 (see Fig. 4) is a circular enlargement of the aperture 13 the purposel of which will hereinafter appear.

15 indicates a plurality of dogs which are inserted into the apertures 13, and which are each formed with a curved shank 16 (see Fig. 5), a T head 17 at one end of the shank and a blade 18 at the opposite end, havlng shoulders 19 and a gripping edge 20. 21 indicates a broken tool rod which it is desired to withdraw from the well.

Having thus described the several parts of my invention, I will now briefly explain its use.

For the purpose of withdrawing a broken rod or cable from the well 1, the do s 15 are inserted into the apertures 13 o the tube 3 by passing the blade 18 entirel through the aperture and turning the shan portion 16 so that the gripping edge 20 is at right angles to the axis of the tube, so that the blade of the dog is free to swing from a substantially horizontal position to an upwardly inclined angle from theinside of the wall of the'tube.

As the device is loweredi over therod, the

blade portions of the dogs are raised, the

proximity to the casing 2, may be led inwardly into the tube 3 and into engagement with the dogs l5.

llhen using the device for withdrawing casing, the tubular extension 8 is substituted, and the dogs are set in the apertures with their blades extending outwardly of the tube, that their gripping edges may engage, on the upward lift of the device, with the casing 2 and withdraw it from the Well.

lt will thus be seen that l have invented a simple and economical device which is powerful in action and which can be relied upon to perform a plurality of functions in removing broken tools and casing from drilled Wells.

llVhat l claim as my invention is:

l. ln a fishing tool for use in drilled wells7 the combination with the tubular body having peripheral slots, a gripping dog extendthrough each slot and laterally recessed to form integral headed ends engaging the sides of the Slot to revent withdrawal eX- Cept when the dog 1s moved to a predetermined position within the slot, and engaging means formed at the end of each dog.

2. A ishing tool of the class described comprising a hollow tube and a plurality of gripping devices carried by the tube and reversib e end for end to dispose the gripinenten ping portions thereof either interiorly or ez:- teriorly of the tube,

3. A fishing tool ot the class described comprising a hollow tube provided with a plurality of slots and a reversible gripping e device for each slot insertable therein to pose the gripping portion oit the device either inwardly or outwardly oit the tube,

d. A ishing tool, comprising a hollow tube provided with a slot, a removable gripping device adapted to be pivotally mounted in said slot to dispose the gripping portion thereof either inwardly or outwardly et the tube, said gripping device comprising n narrow shank adapted to. ass through the slot and a relatively wide enlargement formed integral with each end ot the shanl one of said enlargements being provided with a biting edge, the width of said enlargements being less than the length of the slot to permit removal or applicationof the device when the wide surfaces oit the enlargements are disposed in parallel relation to the longitudinal sides of the slot.

Dated at Vancouver this lst dey oi November, i922. l

GlERGlE ll?. FSrlllEl-t. Witnesses:

il. il. JOHNSTON, llnivns'r ld. Cani/nu. 

